WLUK was always blank in my on-screen programming guide. All other digital channels showed me the current program and by hitting the "guide" button on the remote, I could see the programming schedule for all channels for the upcoming 5 hour period.
WLUK data was never available. Lately there have been problems with WLUK channel displays. I have not had any problems in a few weeks, but today noticed that WLUK now has programming data on screen and in the guide.